[Bug] Nullish coalescing remaining even in bundled code and breaking old browsers

[hyoretsu]

document.head.appendChild(n),
                        {
                            setRoute: t=>{
                                n.dataset.route = t ?? void 0
                            }
                        }

It looks to be this file/line:

speed-insights/packages/web/src/generic.ts

Line 79 in bcad295

script.dataset.route = route ?? undefined;